1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * pm.c - Common OMAP2+ power management-related code
4  *
5  * Copyright (C) 2010 Texas Instruments, Inc.
6  * Copyright (C) 2010 Nokia Corporation
7  */
8 
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/err.h>
13 #include <linux/pm_opp.h>
14 #include <linux/export.h>
15 #include <linux/suspend.h>
16 #include <linux/clk.h>
17 #include <linux/cpu.h>
18 
19 #include <asm/system_misc.h>
20 
21 #include "omap_device.h"
22 #include "common.h"
23 
24 #include "soc.h"
25 #include "prcm-common.h"
26 #include "voltage.h"
27 #include "powerdomain.h"
28 #include "clockdomain.h"
29 #include "pm.h"
30 
31 u32 enable_off_mode;
32 
33 #ifdef CONFIG_SUSPEND
34 /*
35  * omap_pm_suspend: points to a function that does the SoC-specific
36  * suspend work
37  */
38 static int (*omap_pm_suspend)(void);
39 #endif
40 
41 #ifdef CONFIG_PM
42 /**
43  * struct omap2_oscillator - Describe the board main oscillator latencies
44  * @startup_time: oscillator startup latency
45  * @shutdown_time: oscillator shutdown latency
46  */
47 struct omap2_oscillator {
48 	u32 startup_time;
49 	u32 shutdown_time;
50 };
51 
52 static struct omap2_oscillator oscillator = {
53 	.startup_time = ULONG_MAX,
54 	.shutdown_time = ULONG_MAX,
55 };
56 
omap_pm_get_oscillator(u32 * tstart,u32 * tshut)57 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
58 {
59 	if (!tstart || !tshut)
60 		return;
61 
62 	*tstart = oscillator.startup_time;
63 	*tshut = oscillator.shutdown_time;
64 }
65 #endif
66 
omap_pm_clkdms_setup(struct clockdomain * clkdm,void * unused)67 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
68 {
69 	clkdm_allow_idle(clkdm);
70 	return 0;
71 }
72 
73 #ifdef CONFIG_SUSPEND
omap_pm_enter(suspend_state_t suspend_state)74 static int omap_pm_enter(suspend_state_t suspend_state)
75 {
76 	int ret = 0;
77 
78 	if (!omap_pm_suspend)
79 		return -ENOENT; /* XXX doublecheck */
80 
81 	switch (suspend_state) {
82 	case PM_SUSPEND_MEM:
83 		ret = omap_pm_suspend();
84 		break;
85 	default:
86 		ret = -EINVAL;
87 	}
88 
89 	return ret;
90 }
91 
omap_pm_begin(suspend_state_t state)92 static int omap_pm_begin(suspend_state_t state)
93 {
94 	cpu_idle_poll_ctrl(true);
95 	if (soc_is_omap34xx())
96 		omap_prcm_irq_prepare();
97 	return 0;
98 }
99 
omap_pm_end(void)100 static void omap_pm_end(void)
101 {
102 	cpu_idle_poll_ctrl(false);
103 }
104 
omap_pm_wake(void)105 static void omap_pm_wake(void)
106 {
107 	if (soc_is_omap34xx())
108 		omap_prcm_irq_complete();
109 }
110 
111 static const struct platform_suspend_ops omap_pm_ops = {
112 	.begin		= omap_pm_begin,
113 	.end		= omap_pm_end,
114 	.enter		= omap_pm_enter,
115 	.wake		= omap_pm_wake,
116 	.valid		= suspend_valid_only_mem,
117 };
118 
119 /**
120  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
121  * @pm_suspend: function pointer to SoC specific suspend function
122  */
omap_common_suspend_init(void * pm_suspend)123 void omap_common_suspend_init(void *pm_suspend)
124 {
125 	omap_pm_suspend = pm_suspend;
126 	suspend_set_ops(&omap_pm_ops);
127 }
128 #endif /* CONFIG_SUSPEND */
129 
omap_pm_nop_init(void)130 int __maybe_unused omap_pm_nop_init(void)
131 {
132 	return 0;
133 }
134 
135 int (*omap_pm_soc_init)(void);
136 
omap2_common_pm_late_init(void)137 static int __init omap2_common_pm_late_init(void)
138 {
139 	int error;
140 
141 	if (!omap_pm_soc_init)
142 		return 0;
143 
144 	/* Init the voltage layer */
145 	omap3_twl_init();
146 	omap4_twl_init();
147 	omap4_cpcap_init();
148 	omap_voltage_late_init();
149 
150 	/* Smartreflex device init */
151 	omap_devinit_smartreflex();
152 
153 	error = omap_pm_soc_init();
154 	if (error)
155 		pr_warn("%s: pm soc init failed: %i\n", __func__, error);
156 
157 	omap2_clk_enable_autoidle_all();
158 
159 	return 0;
160 }
161 omap_late_initcall(omap2_common_pm_late_init);
162